Watch having a first barrel complete with a diameter that is less than a diameter of a second barrel complete

Abstract

A watch includes a first barrel complete including a first barrel arbor, a first mainspring, and a first barrel, and a second barrel complete that includes a second barrel arbor, a second mainspring, and a second barrel, is disposed side by side in a planar direction orthogonal to a shaft direction of the first barrel arbor, and receives transmission of rotation of the first barrel complete. A tooth tip circle diameter of the first barrel complete is smaller than a tooth tip circle diameter of the second barrel complete, and a thickness of the first barrel is greater than a thickness of the second barrel.

What is claimed is: 
     
       1. A watch comprising:
 a first barrel complete including a first barrel arbor, a first mainspring, and a first barrel; and 
 a second barrel complete that includes a second barrel arbor, a second mainspring, and a second barrel, and is disposed side by side in a planar direction orthogonal to a shaft direction of the first barrel arbor so that rotation of the first barrel complete is transmitted to the second barrel, 
 wherein a tooth tip circle diameter of the second barrel complete is 1.5 to 2.0 times greater than a tooth tip circle diameter of the first barrel complete, and 
 a thickness of the first barrel is greater than a thickness of the second barrel. 
 
     
     
       2. The watch according to  claim 1 , wherein windup torque of the first barrel complete is greater than windup torque of the second barrel complete. 
     
     
       3. The watch according to  claim 1 , wherein the first mainspring is fixed with one end of the first mainspring engaging with a notch formed in an inner circumferential surface of the first barrel, and
 the second mainspring is fixed to an inner circumferential surface of the second barrel by a slipping attachment. 
 
     
     
       4. The watch according to  claim 1  comprising:
 an automatic windup mechanism for winding up the first mainspring, wherein 
 a first ratchet wheel is fixed to the first barrel arbor, and 
 the automatic windup mechanism includes a windup wheel configured to mesh with the first ratchet wheel, and a shaft of the windup wheel does not overlap the first barrel in plan view as viewed from a shaft direction of the first barrel arbor. 
 
     
     
       5. The watch according to  claim 1 , wherein
 a first ratchet wheel is fixed to the first barrel arbor, and 
 a tooth tip circle diameter of the first ratchet wheel is greater than a tooth tip circle diameter of the first barrel complete. 
 
     
     
       6. The watch according to  claim 1  comprising:
 a dial including a plurality of graduations provided thereon, wherein, 
 when the watch is divided into two regions by a line segment connecting the graduations indicating three o'clock and nine o'clock of the dial in plan view as viewed from a direction orthogonal to the dial, the first barrel complete and the second barrel complete are disposed in one of the regions, and a speed governing mechanism for governing a speed of a train wheel driven by the first barrel complete and the second barrel complete is disposed in the other region.